From d6e41525e356a8dc4b9ad6249a644d4123240881 Mon Sep 17 00:00:00 2001 From: David Daney Date: Thu, 15 Jan 2015 16:11:06 +0300 Subject: MIPS: OCTEON: Fix FP context save. It wasn't being saved on task switch. Signed-off-by: David Daney Signed-off-by: Aleksey Makarov Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/8934/ Signed-off-by: Ralf Baechle --- arch/mips/kernel/octeon_switch.S | 19 +++++++------------ 1 file changed, 7 insertions(+), 12 deletions(-) diff --git a/arch/mips/kernel/octeon_switch.S b/arch/mips/kernel/octeon_switch.S index 3dec1e8becf0..2787c014ec56 100644 --- a/arch/mips/kernel/octeon_switch.S +++ b/arch/mips/kernel/octeon_switch.S @@ -31,15 +31,11 @@ /* * check if we need to save FPU registers */ - PTR_L t3, TASK_THREAD_INFO(a0) - LONG_L t0, TI_FLAGS(t3) - li t1, _TIF_USEDFPU - and t2, t0, t1 - beqz t2, 1f - nor t1, zero, t1 - - and t0, t0, t1 - LONG_S t0, TI_FLAGS(t3) + .set push + .set noreorder + beqz a3, 1f + PTR_L t3, TASK_THREAD_INFO(a0) + .set pop /* * clear saved user stack CU1 bit @@ -57,14 +53,13 @@ 1: /* check if we need to save COP2 registers */ - PTR_L t2, TASK_THREAD_INFO(a0) - LONG_L t0, ST_OFF(t2) + LONG_L t0, ST_OFF(t3) bbit0 t0, 30, 1f /* Disable COP2 in the stored process state */ li t1, ST0_CU2 xor t0, t1 - LONG_S t0, ST_OFF(t2) + LONG_S t0, ST_OFF(t3) /* Enable COP2 so we can save it */ mfc0 t0, CP0_STATUS -- cgit v1.2.3